Replace "else if" with "if" in clint.c

Enhance coding style by replacing "else if" with "if". Since it will
return true if it fulfills the condition of the "if" statement.

Author: ranvd

clint.c

@@ -21,12 +21,16 @@ static bool clint_reg_read(clint_state_t *clint, uint32_t addr, uint32_t *value)
     if (addr < 0x4000) {
         *value = clint->msip[addr >> 2];
         return true;
-    } else if (addr < 0xBFF8) {
+    }
+
+    if (addr < 0xBFF8) {
         addr -= 0x4000;
         *value =
             (uint32_t) (clint->mtimecmp[addr >> 3] >> (32 & -!!(addr & 0b100)));
         return true;
-    } else if (addr < 0xBFFF) {
+    }
+
+    if (addr < 0xBFFF) {
         *value = clint->mtime >> (32 & -!!(addr & 0b100));
         return true;
     }
@@ -38,7 +42,9 @@ static bool clint_reg_write(clint_state_t *clint, uint32_t addr, uint32_t value)
     if (addr < 0x4000) {
         clint->msip[addr >> 2] = value;
         return true;
-    } else if (addr < 0xBFF8) {
+    }
+
+    if (addr < 0xBFF8) {
         addr -= 0x4000;
         int32_t upper = clint->mtimecmp[addr >> 3] >> 32;
         int32_t lowwer = clint->mtimecmp[addr >> 3];
@@ -49,7 +55,9 @@ static bool clint_reg_write(clint_state_t *clint, uint32_t addr, uint32_t value)
 
         clint->mtimecmp[addr >> 3] = (uint64_t) upper << 32 | lowwer;
         return true;
-    } else if (addr < 0xBFFF) {
+    }
+
+    if (addr < 0xBFFF) {
         int32_t upper = clint->mtime >> 32;
         int32_t lowwer = clint->mtime;
         if (addr & 0b100)